<template>
  <div>
    <el-form ref="loginForm" :model="form" :rules="rules" label-width="80px" class="login-box">
      <h3 class="login-title">欢迎登录</h3>
      <el-form-item label="账号" prop="username">
        <el-input type="text" placeholder="请输入账号" v-model="form.username" />
      </el-form-item>
      <el-form-item label="密码" prop="password">
        <el-input type="password" placeholder="请输入密码" v-model="form.password" />
      </el-form-item>
      <el-form-item>
        <el-button type="primary" v-on:click="onSubmit('loginForm')">登录</el-button>
      </el-form-item>
    </el-form>

    <el-dialog
      title="温馨提示"
      :visible.sync="dialogVisible"
      width="30%"
      :before-close="handleClose"
      >
      <span>请输入账号和密码</span>
      <span slot="footer" class="dialog-fotter">
        <el-button type="primary" v-on:click="dialogVisible = false">确定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
    export default {
      name: "Login",
      data() {
        return{
          form: {
            username: '',
            password: ''
          },

          // 表单验证，需要在 el-form-item 元素添加 prop 属性
          rules: {
            username: [
              {required: true, message: '账号不能为空', trigger: 'blur'}
            ],
            password: [
              {required: true, message: '密码不能为空', trigger: 'blur'}
            ],
          },

          // 对话框显示和隐藏
          dialogVisible : false
        }
      },
      methods: {
        onSubmit(formName) {
          // 为表单绑定验证功能
          this.$refs[formName].validate((valid) => {
            if (valid) {
              // 使用 vue-router 路由到指定页面，该方式称之为编程式导航
              this.$router.push('/main/'+this.form.username);
            } else{
              this.dialogVisible = true;
              return false;
            }
          });
        }
      }
    }
</script>

<style scoped>
  .login-box{
    border: 1px solid #DCDFE6;
    width: 350px;
    margin: 180px auto;
    padding: 35px 35px 15px 35px;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    box-shadow: 0 0 25px #909399;
  }
  .login-title{
    text-align: center;
    margin: 0 auto 40px auto;
    color: #303133;
  }
</style>
